September Weather in Black River Falls, United States

Last updated: June 24, 2025

In September, the average temperature in Black River Falls, United States is a pleasant 18°C (64°F). However, don't be surprised if temperatures dip as low as 1°C (34°F) or soar to a balmy 34°C (93°F). With an average humidity of 80%, expect a bit of a muggy feel. Prepare for 104 mm (4.1 in) of rain spread over approximately 10 days, making it wise to pack an umbrella!

September Temperature in Black River Falls

In September in Black River Falls, the average temperature is 18°C (64°F). The maximum can reach 34°C (93°F), while the minimum can be as low as 1°C (34°F). This variation in temperatures makes it essential to pack a variety of clothing options for your trip.

September Weather in Black River Falls: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Black River Falls, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Black River Falls, September typically has an average temperature of 18°C (64°F), with highs reaching up to 34°C (93°F) and lows dropping to around 1°C (34°F).

Data source: Temperature data for Black River Falls generated using information from the Copernicus Climate Change Service.

September Precipitation in Black River Falls

In Black River Falls in September, the precipitation amount is 104 mm (4.1 in) over a period of 10 days.

September Precipitation Trends in Black River Falls

The chart displays monthly precipitation patterns in Black River Falls, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Black River Falls, September typically receives around 104 mm (4.1 inches) of precipitation spread over approximately 10 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Black River Falls

In Black River Falls in September humidity is 80%. With an average temperature of 18°C (64°F), this humidity feels like a warm, damp blanket wrapping around you, making travel a bit more exhausting as the air thickens and the heat clings to your skin.

September Average Humidity in Black River Falls

This chart illustrates the average monthly humidity levels in Black River Falls, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Black River Falls is approximately 80%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Black River Falls

In Black River Falls in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Black River Falls.

Maximum UV Index Levels in Black River Falls for September

The chart shows the monthly maximum UV Index (UVI) for Black River Falls in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Black River Falls typically reaches 7, which falls under the high exposure category.

Data source: Black River Falls September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How September Weather in Black River Falls Compares to Other Months

Weather in Black River Falls varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Black River Falls, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Black River Falls, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-7°C (19°F)	34 mm (1.3 inches)	88%	low
February Weather	-7°C (20°F)	52 mm (2.0 inches)	89%	moderate
March Weather	1°C (35°F)	57 mm (2.3 inches)	86%	moderate
April Weather	7°C (45°F)	89 mm (3.5 inches)	85%	very high
May Weather	15°C (59°F)	133 mm (5.2 inches)	79%	very high
June Weather	21°C (70°F)	133 mm (5.2 inches)	80%	very high
July Weather	23°C (73°F)	109 mm (4.3 inches)	80%	very high
August Weather	21°C (70°F)	123 mm (4.8 inches)	78%	very high
September Weather	18°C (64°F)	104 mm (4.1 inches)	80%	high
October Weather	10°C (49°F)	114 mm (4.5 inches)	84%	moderate
November Weather	1°C (35°F)	52 mm (2.1 inches)	89%	moderate
December Weather	-4°C (26°F)	47 mm (1.9 inches)	85%	low